Abstract:
:Phylogenetic analyses of ribosomal RNA gene sequences (rDNAs) retrieved from an Australian desert soil sample (Sturt National Park) revealed the presence of a number of clones which branched deeply from the high GC Gram-positive division line of descent. The most abundant group of these clones were related to Rubrobacter. An oligonucleotide probe was designed to have broad specificity to Rubrobacter and relatives. This probe was used to interrogate eight rDNA libraries representing four distinct land forms within the Australian arid zone. Relative abundance of Rubrobacter-relatives in these samples ranged from 2.6 to 10.2%. Clones from these libraries were selected for sequence analysis on the basis of a heteroduplex mobility assay to maximise the diversity represented in the sample. Phylogenetic analyses of these rDNA clones and Rubrobacter-related clones reported in the literature show strong support for three distinct groups. Database-searching revealed 'Rubrobacteria' were relatively abundant in a number of published soil rDNA libraries but absent from others. A PCR assay for group-1 'Rubrobacteria' was used to test for their presence in 21 environmental samples. Only marine and arid-zone soil samples gave positive PCR results. Taken together these results indicate 'Rubrobacteria' are a widespread group of variable abundance and diversity.
journal_name
FEMS Microbiol Ecoljournal_title
FEMS microbiology ecologyauthors
Holmes AJ,Bowyer J,Holley MP,O'Donoghue M,Montgomery M,Gillings MRdoi
10.1111/j.1574-6941.2000.tb00733.xsubject
Has Abstractpub_date
2000-08-01 00:00:00pages
111-120issue
2eissn
0168-6496issn
1574-6941pii
S0168-6496(00)00051-9journal_volume
33pub_type
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